Please explain the following questions comprehensively by providing concepts, examples ,and explanations :)

a. PRICE ELASTICITY OF DEMAND AND SUPPLY FOR DOMESTIC AIRLINES IN THE PHILIPPINES

Describe the price elasticity of demand and supply for the good/service and identify factors that could affect changes in elasticity in the long run.

b. MARKET STRUCTURE OF DOMESTIC AIRLINES IN THE PHILIPPINES

Explain the market structure for the good/service in the Philippines: perfectly competitive, monopolistic competition, oligopolistic, or monopoly.